我在symfony 2.8应用程序中导出excel / csv之一时遇到问题

Question

I have a problem with csv uploading in a symfony 2.8 application but it is only occurring in one client.

The log from CloudWatch:

CRITICAL: Uncaught PHP Exception RuntimeException: "Your data could not be encoded because it contains invalid UTF8 characters." at /www/vendor/jms/serializer/src/JMS/Serializer/JsonSerializationVisitor.php.

Has anyone else encountered this? Help and tips would be highly appreciated.

Thank You!